写出mistake 、can 、may 、will 、shall 的过去式和过去分词. mistook，mistaken；could；might，would，should后面四个都只有过去式，没有过去分词的
should的过去式是什么？ should是shall过去式，但当should本身做一个词的时候不能把它当作shall的过去式.should作独立的情态动词时候没有过去式和过去分词例句：I knew if I kept at it I should succeed我知道如果我坚持下去就会成功.You should take advantage of it你应该好好利用这个机会.
shall的过去式和过去分词 should
它们的过去式、过去分词 帮忙写一下谢谢了 过去式：should rang hurried stayed tried changed picked entered knocked hurried traveled planned stopped destroyed 故去分词：should rung hurried stayed tried changed picked entered knocked hurried tra.
